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Theory and Design of CMOS HSTL I/O Pads
To control reflections, the impedance of integrated circuit output pad drivers must be matched to the impedance of the transmission lines to which the pads are connected. HP's HSTL (high-speed transceiver logic) controlled impedance I/O pads use an on-chip impedance matching network that compensates for process, voltage, and temperature (PVT) variations.
by Gerald L. Esch, Jr. and Robert B. Manley
 Article 5 - aug98a5.pdf
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